Peter and his dog are sailing under the water in their little submarine until . . . woosh! They run aground. The tide is going out, and Peter is stuck. They have to spend the night on the little sandbank, but soon they discover that they''re not alone. Who could it be making that strange shuffling sound? Illustrations.

From the Publisher:

Peter and his dog are sailing up and under the water in their little submarine until....woosh! They run aground. The tide is going out and Peter is stuck. They have to spend the night on the little sandbank, but soon they discover that they're not alone. Who could it be making that strange shuffling sound?